you cant get one on leafgreen you have to trade it over from ruby Sapphire or emerald
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Heart scales are only in Pokemon emerald, ruby and sapphire but you can get one if you trade a heart scale from ruby or emerald or sapphire to leafgreen then take it but it will not do anything in the game.
A Heart Scale is a scale that is shaped like a heart and in most games with the exception of FireRed, LeafGreen and XD are the items that are used as payment in exchange for the Move Reminder's services of helping one of your Pokemon to remember either a forgotten or missed move.
you use it for the move maniac who reteaches your Pokemon a moves for one heart scale
if you get the Pokemon that the newspaper guy wants he will give you a heart scale and some rear poke balls
All you get is an evolution item, like metal coat or dragon scale